In my opinion, if you only look at what quality of life you get in Europe vs. the US I'd say Europe is better. That depends of coruse where in Europe you live. Europe consists of both wealthy and not so wealthy countries, so just saying "Europe" isn't really correct.
If you want to make money and have a low living cost, the US by far. Less taxation and where nobody will judge you for having a large paycheck, unlike where I'm from where you'll be punished and taxed in any way possible. In the end, I feel like you get to keep way more money in the US than in Europe generally, and the governments of some countries in Europe are more lefty than in the US. Here in Sweden, we have a good quality of life (so far, but not for much longer as it's rapidly getting worse) but you'll be taxed to death compared to the US.
I guess it all comes down to what's mroe important to YOU. But I really hope you make the right decision for what you think is best for you!